370 research outputs found
Research on an alternative method of turbine motor signal
In the modern mortar radio fuze, the use of turbine generators as the power source for fuzes is very common. The ballistic air pressure during the flight of the projectiles is used as the driving force to drive the turbine motor. In this paper, the turbine motor signal is parameterized in combination with the actual situation, and the idea of using the hardware to simulate the turbine power generation is proposed. The generation of the turbine motor signal is simulated by means of simulation software. Design the circuit to verify the simulation results, and have a certain reference for how to easily detect the fuze in the mass production process
Long Range Intrinsic Ferromagnetism in Two Dimensional Materials and Dissipationless Future Technologies
The inherent susceptibility of low-dimensional materials to thermal
fluctuations has long been expected to poses a major challenge to achieving
intrinsic long-range ferromagnetic order in two-dimensional materials. The
recent explosion of interest in atomically thin materials and their assembly
into van der Waals heterostructures has renewed interest in two-dimensional
ferromagnetism, which is interesting from a fundamental scientific point of
view and also offers a missing ingredient necessary for the realization of
spintronic functionality in van der Waals heterostructures. Recently several
atomically thin materials have been shown to be robust ferromagnets. Such
ferromagnetism is thought to be enabled by magneto crystalline anisotropy which
suppresses thermal fluctuations. In this article, we review recent progress in
two-dimensional ferromagnetism in detail and predict new possible
two-dimensional ferromagnetic materials. We also discuss the prospects for
applications of atomically thin ferromagnets in novel dissipationless
electronics, spintronics, and other conventional magnetic technologies.
Particularly atomically thin ferromagnets are promising to realize time
reversal symmetry breaking in two-dimensional topological systems, providing a
platform for electronic devices based on the quantum anomalous Hall Effect
showing dissipationless transport. Our proposed directions will assist the
scientific community to explore novel two-dimensional ferromagnetic families
which can spawn new technologies and further improve the fundamental
understanding of this fascinating area.Comment: To be appear in Applied Physics Review
Research on a simulation scheme of penetration overload signal
In this paper, the types of penetrating collision overload signals are analyzed, and a detection device for simulating the signal of the penetration process is designed in combination with engineering practice. The device uses asimulated signal generation circuit to simulate the overload signal of the projectile actually hitting the target during the penetration process. The Pspice simulation software is used to simulate the voltage overload of the simulated overload signal, and the feasibility and stability of the signal generation are verified by the prototype test. The simulation signal proposed by the design scheme can be used to simulate the penetration overload signals for different initial speeds and different targets, and it has certain guiding significance for the pre-design simulation test of engineering projects
3DCFS : Fast and robust joint 3D semantic-instance segmentation via coupled feature selection
We propose a novel fast and robust 3D point clouds segmentation framework via coupled feature selection, named 3DCFS, that jointly performs semantic and instance segmentation. Inspired by the human scene perception process, we design a novel coupled feature selection module, named CFSM, that adaptively selects and fuses the reciprocal semantic and instance features from two tasks in a coupled manner. To further boost the performance of the instance segmentation task in our 3DCFS, we investigate a loss function that helps the model learn to balance the magnitudes of the output embedding dimensions during training, which makes calculating the Euclidean distance more reliable and enhances the generalizability of the model. Extensive experiments demonstrate that our 3DCFS outperforms state-of-the-art methods on benchmark datasets in terms of accuracy, speed and computational cost
Superconducting Properties of Graphene Doped Magnesium Diboride
Graphene, carbon in the form of monolayer sheets, has revealed astonishing and unique chemical and physical properties, which have made it an extremely active research topic in both materials science and physics (Novoselov, K. S. et al., 2004). Through chemical and materials integration, graphene is being actively exploited in a range of technological applications (Stankovich, S. et al., 2006). Superconductors can carry electrical current without any energy dissipation. The combination of both graphene and a superconductor into a composite has great potential for electrical devices and large scale applications. MgB2, a superconductor with a simple composition and two-gap feature has great potential for large current carrying applications, as demonstrated through a series of chemical dopings (Dou, S. X. et al. 2007). In the case of graphene’s, the strict two-dimensionality and its high electrical and thermal conductivities, make it an ideal candidate for integrating/doping into MgB2 in order to improve the superconducting properties
Inner ear implants for experimental electrical stimulation of auditory nerve arrays
Electrode arrays chronically implanted in the inner ear are gaining increased use for experimental studies of the auditory nervous system, as well as for studies related to development of improved auditory prostheses. Commercially available electrode arrays are designed for human use and thus may be unsuitable for experimental studies, particularly in small animals. This paper describes a simple, inexpensive method for making custom electrode arrays in a variety of configurations, suitable for animals ranging from small rodents to non-human primates.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/27909/1/0000330.pd
Unabridged phase diagram for single-phased FeSexTe1-x thin films
A complete phase diagram and its corresponding physical properties are
essential prerequisites to understand the underlying mechanism of iron based
superconductivity. For the structurally simplest 11 (FeSeTe) system, earlier
attempts using bulk samples have not been able to do so due to the fabrication
difficulties. Here, thin FeSexTe1-x films with the Se content covering the full
range were fabricated by using pulsed laser deposition method. Crystal
structure analysis shows that all films retain the tetragonal structure in room
temperature. Significantly, the highest superconducting transition temperature
(TC = 20 K) occurs in the newly discovered domain, 0.6 - 0.8. The single-phased
superconducting dome for the full Se doping range is the first of its kind in
iron chalcogenide superconductors. Our results present a new avenue to explore
novel physics as well as to optimize superconductors
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